Smooth-surface folding square.



No. 659,032. y Patented 0st. 2, |900.

E. C. LARSSEN.

SMOUTH SURFAEE FDLDING SUUARE.

,(Appucatiop med Nov. 2o, 1899.) (No Model.)

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EDDYC. LARSEN, OF ST. LOUIS, MISSOURI.

SMOOTH-SURFACE FOLDING SQUARE.

SPECIFICATION forming part of Letters Patent No. 659,032, dated October 2, 1900.

Application filed November 20, 1899. Serial No. 737,617. (No model.)

To all whom t may concern:

Be it known that I, EDDY C. LARSEN, of the city of St. Louis, Stare of Missouri, have invented certain new and useful Improvements in Smooth-Surface Folding Squares, of which the following is a full, clear,'and exact description, reference being had to the accompanying drawings, forming a part hereof.

This invention relates to folding squares; and it consists of the novel construction, combination, and arrangement of parts hereinafter shown, described, and claimed.

The object of this invention is to construct a square which can be folded and carried in the pocket of the one using it or placed in a small chest, said square being provided with a means whereby it can be looked in its normal or square position.

Figure l is a perspective View showing my invention in a. folded position. Fig. 2 is a side view of the square in a normal or square position. Fig. 3 is' a front view of F-ig. l. Fig. 4 is a View of Fig. 2 on the line 44. Fig. 5 is a longitudinal sectional view of the folding arm, showing the construction of the same, taken on line 5 5 of Fig. 4.

In the construction of this device I provide a square l, having the arm A, consisting of two parts 2 3, separating along the oblique line 4 4. Integral with the part 3 is the arm 4, which projects into a mortise 5 in the part 2 and is there pivoted by the pin 6. A tenon 7 on the part 2 fits into the mortise 8 in the part 3 when the parts are in their normal or square position, as shown in Fig. 2. A keyseat 9 is arranged on each side of the arm A, a portion of said key-seats lying in each of the parts 2 3. Into said key-seats are dove tailed the locking-keys 10. The portions of the key-seats 9 lying in the part 3 are of equal .length with the keys l0 in order that said keys 10 may be slid back into tho key-seat 9 pastthe point l1, allowing the part 3 to be folded in the manner shown in Fig. l.

A device of this kind would be both convenient and useful. It can be easily folded and carried in a small boX or in the pocket of any one using it, and little cost is necessirated in its construction.

I olaim- A folding square having one side composed of two parts 2, 3, the part 2 being integral with the main part of the square, an arm 4 integral with the part 3, the said arm being pivotally secured Within a mortise in the part 2, a tenon 7 integral with the part 2 and operating within a mortise in the part 3, and a key removably carried on each side of the folding part 3 for looking the same in a normal or square position, substantially as specifled.

In testimony whereof I affix my signature in presence of two witnesses.

EDDY C. LARSEN.

Witnesses:

Roscon F. -B1nNENsT0K, JOHN C. HIGDON, 

